UCWA events in Skype for Business Server
Summary: Learn about the Unified Communications Web API (UCWA) in Skype for Business Server.
Skype for Business Server uses the Unified Communications Web API (UCWA) for several purposes, from accessing Microsoft Exchange for contact searches to updating presence for mobile clients.
UCWA writes records of operational behavior as event types Informational, Warning, and Error. The following table describes the events that can be written by the UCWA components.
| Event ID | Event type | Summary | Cause and resolution |
|---|---|---|---|
| 20001 |
Informational |
UCWA initialized |
N/A N/A |
| 20002 |
Error |
UCWA encountered an unexpected exception during initialization |
An unexpected error occurs during initialization Examine the exception details in the associated event log entry to determine the possible cause |
| 20003 |
Error |
UCWA encountered an unhandled exception |
An unhandled exception happened Restart the server. If the problem persists contact product support |
| 20004 |
Error |
Can't access Exchange for HD photo |
Connection to Exchange isn't available Make sure the connection to Exchange is available |
| 20005 |
Informational |
Recovered from failing to access Exchange for HD photo |
N/A |
| 20006 |
Error |
Can't access Exchange for contact search |
Connection to Exchange isn't available Make sure the connection to Exchange is available |
| 20007 |
Informational |
Recovered from failing to search contact in Exchange |
N/A |
| 20008 |
Warning |
Attempt to subscribe more than the allowed presence subscriptions per application |
Attempt to subscribe more than the allowed presence subscriptions per application Check the clients for unnecessary subscriptions |
| 20009 |
Warning |
Attempt to subscribe more than the allowed presence subscriptions per batch |
Attempt to subscribe more than the allowed presence subscriptions per batch Check the clients for unnecessary subscriptions |
| 20010 |
Error |
Can't retrieve inband data |
Can't retrieve inband data If the problem persists contact product support |
| 20011 |
Error |
Cannot subscribe presence |
Cannot subscribe presence If the problem persists contact product support |
| 20012 |
Error |
Failed to register endpoint |
Failed to register endpoint If the problem persists contact product support |
| 20013 |
Error |
IM MCU is unavailable |
IM MCU is unavailable See whether IM MCU is running |
| 20014 |
Informational |
Recovered from failing to connect to IM MCU |
N/A |
| 20015 |
Error |
AV MCU is unavailable |
AV MCU is unavailable See whether AV MCU is running |
| 20016 |
Informational |
Recovered from failing to connect to AV MCU |
N/A |
| 20017 |
Error |
AS MCU is unavailable |
AS MCU is unavailable See whether AS MCU is running |
| 20018 |
Informational |
Recovered from failing to connect to AS MCU |
N/A |
| 20019 |
Error |
Data MCU is unavailable |
Data MCU is unavailable See whether Data MCU is running |
| 20020 |
Informational |
Recovered from failing to connect to Data MCU |
N/A |
| 20021 |
Error |
Cannot join IM MCU |
Cannot join IM MCU See whether IM MCU is running |
| 20022 |
Error |
Cannot join AV MCU |
Cannot join AV MCU See whether AV MCU is running |
| 20023 |
Error |
Cannot join AS MCU |
Cannot join AS MCU See whether AS MCU is running |
| 20024 |
Error |
Cannot join Data MCU |
Cannot join Data MCU See whether Data MCU is running |
| 20025 |
Error |
Cannot access active directory for photo |
Connection to active directory is not available Make sure the connection to active directory is available |
| 20026 |
Informational |
Recovered from failing to access active directory for photo |
N/A |
| 20027 |
Warning |
Cannot deserialize |
Cannot deserialize If the problem persists contact product support |